From 1b834cacadf469b50afdba197b7fec502e1fd93d Mon Sep 17 00:00:00 2001
From: Jan-Hendrik Willms <tleilax+studip@gmail.com>
Date: Mon, 3 Nov 2025 12:34:39 +0100
Subject: prevent fatal error when booking user is missing, fixes #6012

Closes #6012

Merge request studip/studip!4588
---
 db/migrations/5.4.21_cleanup_consultation_bookings.php | 17 +++++++++++++++++
 lib/models/ConsultationBooking.php                     | 12 ++++++++++++
 lib/models/ConsultationSlot.php                        |  1 +
 3 files changed, 30 insertions(+)
 create mode 100644 db/migrations/5.4.21_cleanup_consultation_bookings.php

diff --git a/db/migrations/5.4.21_cleanup_consultation_bookings.php b/db/migrations/5.4.21_cleanup_consultation_bookings.php
new file mode 100644
index 0000000..3c7d9f7
--- /dev/null
+++ b/db/migrations/5.4.21_cleanup_consultation_bookings.php
@@ -0,0 +1,17 @@
+<?php
+final class CleanupConsultationBookings extends Migration
+{
+    public function description()
+    {
+        return 'Removes orphaned entries from consultation_bookings';
+    }
+
+    protected function up()
+    {
+        $query = "DELETE `consultation_bookings`
+                  FROM `consultation_bookings`
+                  LEFT JOIN `auth_user_md5` USING (`user_id`)
+                  WHERE `auth_user_md5`.`user_id` IS NULL";
+        DBManager::get()->exec($query);
+    }
+}
diff --git a/lib/models/ConsultationBooking.php b/lib/models/ConsultationBooking.php
index 026e727..4f77c7c 100644
--- a/lib/models/ConsultationBooking.php
+++ b/lib/models/ConsultationBooking.php
@@ -113,6 +113,18 @@ class ConsultationBooking extends SimpleORMap implements PrivacyObject
     }
 
     /**
+     * @return self[]
+     */
+    public static function findValidBySlot_id(int $slot_id): array
+    {
+        return self::findBySQL(
+            'JOIN auth_user_md5 USING (user_id)
+             WHERE slot_id = ?',
+            [$slot_id]
+        );
+    }
+
+    /**
      * Returns whether a user may create a booking for the given range.
      *
      * @param User $user
diff --git a/lib/models/ConsultationSlot.php b/lib/models/ConsultationSlot.php
index c7aa78e..fe8c21b 100644
--- a/lib/models/ConsultationSlot.php
+++ b/lib/models/ConsultationSlot.php
@@ -41,6 +41,7 @@ class ConsultationSlot extends SimpleORMap
         ];
         $config['has_many']['bookings'] = [
             'class_name'        => ConsultationBooking::class,
+            'assoc_func'        => 'findValidBySlot_id',
             'assoc_foreign_key' => 'slot_id',
             'on_store'          => 'store',
             'on_delete'         => 'delete',
-- 
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